UPDATE: "We are thrilled to be welcoming baby number 5 this summer!" Trump Jr. exclusively tells Us Weekly. "Vanessa and I can't wait to continue the adventure of raising the big family we have always wanted and have been blessed to receive."

Trump Jr., 36, who is the eldest son of Donald Trump and first wife Ivana Trump, married model Vanessa in November 2006. They are parents to daughter Kai, 6, and sons Donald John Trump III, 4, Tristan, 2, and Spencer, 15 months.